Isuzu N-Series. Service manual — part 109
SERVICE INFORMATION 00-9
Excessive Tire Wear
1. Improper tire pressure.
1. Properly inflate to recommended pres-
sure.
2. Incorrect tire/wheel usage.
2. Install correct tire/wheel combination.
3. Defective shock absorbers.
3. Repair or replace.
4. Front end out of alignment.
4. Align front end.
5. Loose, worn or damaged steering link-
age, joints, suspension components,
bushing and ball joints.
5. Inspect, repair or replace as required.
Dual Tires Rubbing
Insufficient wheel spacing.
Check tire and wheel sizes.
PROBLEM
POSSIBLE CAUSE
CORRECTION
00-10 SERVICE INFORMATION
MAIN DATA AND SPECIFICATIONS
Front End Alignment
Power Steering Unit
Wishbone
Suspension
NHR Rigid
NKR Rigid
NPR
NQR
NPS
Steering Angle
Inner
(deg.)
38.0
°
37.5
°
38.5
°
(7.00-15
Tire)
47.5
°
(7.00-16
Tire)
42.5
°
(7.50-16
Tire)
37.5
°
35.5
°
(7.00-16
Tire)
42.5
°
(7.50-16
Tire)
36.5
°
(8.25-16
Tire)
Outer
(deg.)
35.0
°
33.0
°
29.5
°
(7.00-15
Tire)
35.0
°
(7.00-16
Tire)
32.7
°
(7.50-16
Tire)
29.8
°
27.9
°
(7.00-16
Tire)
32.7
°
(7.50-16
Tire)
30.0
°
(8.25-16
Tire)
Wheel Alignment
Toe-in
mm (in.)
−2−2 (−0.08−0.08)
Camber
(deg.)
0
°15′±45′
1
°15′±45′
0
°15′±45′
0
°15′±45′
0
°15′±45′
0
°15′±45′
Caster
(deg.)
1
°00′±1°
1
°30′±1°
3
°00′±1°
2
°45′±1°
2
°45′±1°
2
°00′±1°
King Pin Incli-
nation
(deg.)
9
°45′±30′
7
°15′
12
°00′
12
°00′
12
°00′
7
°15′
Right Hand Drive
Left Hand Drive
Type
Integral rotary valve type
Number of Ball
28
Gear Ratio
22.6 NKR (Indep)
22.6 NKR (Rigid)
18.8 — 20.9 NPR, NQR, NPS (Rigid)
Ball Screw Lead
mm (in.)
9.172 (0.361) NHR, NKR (Rigid)
9.922 (0.391) NPR, NQR, NPS
9.922 (0.391) NKR (Indep)
Torsion Bar Spring Constant
N
⋅cm/deg (kg⋅cm/deg.)
15.7 (16.0)
Valve Operating Angle
(deg.)
±7°
Regulated Oil Pressure
kPa (kg/cm
2
/psi)
NHR, NKR
10,297 (105/1,439)
NPR, NQR, NPS
11,287 (115/1,635)
Regulated Oil Flow Volume
(minimum)
liter/min (US gal/min / UK
gal/min)
8 (2.11/1.76)
SERVICE INFORMATION 00-11
Power Steering Oil Pump Unit
Tandem Hydraulic Pump
Manual Steering Unit
4J Series Engine
4H Series Engine
Type
Vane type
Theoretical Delivery
(cm
3
/rev)
7.2
8.1
Regulated Oil Flow volume
(liter/min)
8.5 — 6.5
8.0 — 6.5
Regulated Oil Pressure
kPa (kg/cm
2
/psi)
NHR, NKR
10,297 (105/1,493)
10,297 (105/1,493)
NPR, NPS
10,787 (110/1,564)
NQR
11,278 (115/1,635)
Maximum Allowable Speed
(r.p.m)
6,500
6,500
Hydraulic Booster Pump
Power Steering Pump
Type
Vane type
Theoretical Delivery
(cm
3
/rev)
13
8.4
Regulated Oil Flow volume
(liter/min)
8.0
8.0 — 6.5
Regulated Oil Pressure
kPa (kg/cm
2
/psi)
11,770 (120/1,706)
10,790 (110/1,564)
Maximum Allowable Speed
(r.p.m)
6,500
NHR, NKR
NPR, NQR
Type
Recirculating ball type
Sector Shaft Outside Diameter
mm (in.)
34.295
38.1
Number of Ball
28
× 2
50
× 2
Gear Ratio
24.5 — 28.5
27.7 — 31.7
00-12 SERVICE INFORMATION
SERVICE STANDARD
ITEMS
SERVICE STANDARD
SERVICE LIMIT
Power Steering
Sector Shaft Outside Diameter
mm (in)
RHD&LHD
39,975 (1.574)
Play between Sector Shaft and
Bearing
mm (in)
RHD
—
0.12 (0.0047)
LHD
—
0.20 (0.0080)
Backlash between Sector
Shaft and Ball Nut
mm (in)
RHD&LHD
0.12 (0.0047)
Steering Wheel Free Play
mm (in)
10 — 50 (0.4 — 2.0)
Power Steering Fluid Pressure
(at idling engine speed)
kPa (kg/cm
2
/psi)
NQR without HBB
11,278 (115/1,635)
NPR/NPS/NQR with HBB
10,787 (110/1,564)
except Above Models
10,297 (105/1,493)
Manual Steering
Sector Shaft Outside Diameter
mm (in)
NHR, NKR
34.925 (1.375)
34.825 (1.371)
NPR, NQR
38.100 (1.500)
38.000 (1.496)
Play between Sector Shaft and
Needle Bearing
mm (in)
—
0.2 (0.008)
Ball Nut Axial Play
mm (in)
—
0.1 (0.004)
Worm Shaft Starting
Torque
N
⋅m (kg⋅m/lb⋅ft)
(Without Sector Shaft)
NHR, NKR
0.34 — 0.64 (0.035 — 0.065/
0.25 — 0.47)
NPR, NQR
0.29 — 0.69 (0.030 — 0.070/
0.22 — 0.51)
(With Sector Shaft)
NHR, NKR
0.54 — 1.03 (0.055 — 0.105/
0.40 — 0.76)
NPR, NQR
0.98 (0.1/0.72) or less
Backlash between Sector
Shaft and Ball Nut
mm (in)
NHR, NKR
0.2 (0.0079) or less
NPR, NQR
0.5 (0.0197) or less
Steering Wheel Free Play
mm (in)
10 — 30 (0.4 — 1.2)
Suspension
Spring Pin Outside Diameter
mm (in)
25 (0.98)
24.7 (0.019)
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